An expression meaning it didn't start just now; it's been happening for a long time — often used to emphasize that a problem is longstanding.
その店の対応が悪いのは今に始まったことではない。
The store's poor service is nothing new.
給料が低いのは今に始まったことではないが、最近は特に厳しい。
Low wages aren't a new problem, but lately it's been especially tough.
遅延が続いているのは今に始まったことではなく、以前からの課題だ。
The ongoing delays are not something that started recently; it's been an issue for some time.